1221 – Cobalt Grade 21 Electrode

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INTERNATIONAL CLASSIFICATIONS

AWS/ASME A 5.13 ECoCr-E

EN 14700 E Co1

DIN 8555: E20-UM-350-CKTZ

FEATURES & APPLICATIONS

High-duty overlays of sealing faces and moving parts of valve seats and valves of combustion engines, for pumps and fittings for gas, water, steam and acids, gas turbines and hot working tools.

  • Extremely smooth running Alloy 21 Cobalt electrode.
  • Excellent resistance to metal and mineral abrasion.
  • Slag is self releasing.
  • Weld deposits are unusually fine rippled and uniform.
  • Available bare as product code 1290.
  • Special technology also performs on AC current.
All Weld Metal Analysis (Typical Weight %)

Microstructure: Cobalt based austenite with some carbides and other complex phases.

Flux Color: Grey

Tip Color: Black

CMnSiCrFeMoNiWCo
.251.51.027264.50Bal.
Typical Mechanical Properties

Undiluted Weld Metal Maximum Value Up to:

Hardness

Room Temperature: 68°F (20°C) Rockwell C30-32

Work Hardened Rockwell C45

Elevated Temperatures: 750°F (400°C) Rockwell C33

110°F (600°C) Rockwell C30

1475°F (800°C) Rockwell C28

1620°F (900°C) Rockwell C26

Welding Current & Instructions

Recommended Current: AC or DC Reverse (+)

Welding Techniques: Preheat massive parts to 570°F (300°C). Minimize amperage during welding.

Recommended Amperage Settings:

Diameter (mm)3/32(2.5)1/8(3.25)5/32 (4.0)
Minimum Amperage6580100
Maximum Amperage85110130

Welding Positions: Flat, horizontal

Deposition Rates:

Diameter (mm)Length (mm)Weldmetal/ ElectrodeElectrodes per lb (kg) of WeldmetalArc Time of Deposition min/lb (kg)Amperage SettingsRecovery Rate
3/32 (2.5)14″ (350).80 oz. (22g)20 (44)19 (42)75130%
1/8 (3.25)14″(350)1.2 oz (33g)13 (29)14 (31)95130%
5/32 (4.0)14″ (350)1.56 oz (44g)10 (22)11 (24)115130%
APPROXIMATE ELECTRODE PACKAGING & DIMENSIONS
Diameter (mm)3/32 (2.5)1/8 (3.25)5/32 (4.0)
Length (mm)14″ (350)14″ (350)14″ (350)
Electrodes / lb18117
Electrodes / kg402516